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Che Husna Azhari - One of the best experts on this subject based on the ideXlab platform.

  • Crashworthiness characteristics of natural ramie/bio-Epoxy Composite tubes for energy absorption application
    Iranian Polymer Journal, 2018
    Co-Authors: M. J. Ghoushji, Reza Alebrahim, S. Abdullah, Rozli Zulkifli, Abu Bakar Sulong, Che Husna Azhari
    Abstract:

    Using metallic materials in automotive structures increases weight, fuel consumption and cost, therefore, certain trends have begun to use lightweight and cheaper materials. Fibre Composites are used in automotive applications because they are stiff, lightweight and stronger than bulk material, as well as they have a comparable energy-absorbing capacity to that of metallic materials. The aim of this study is to investigate the potentials in natural ramie/bio-Epoxy Composite in crash energy absorption applications. Cubic specimens consisted of 12, 24 and 30 plies of ramie/bio-Epoxy laminates with 50, 80 and 120 mm long which were prepared by hand layup method. Static axial compression load was then applied and the energy-absorbing capability of the ramie/Epoxy Composite was evaluated. The crashworthiness characteristics of the Composite tubes were evaluated by measuring the average and peak crushing load, specific energy absorption, total absorbed energy and crush force efficiency in quasi-static axial compression. The failure mode and behaviour of the tubes were investigated by taking photographs and recording the load–displacement curves during the test accomplishment. The test results indicated that natural ramie/bio-Epoxy Composite tube has the great potential to be used as an effective energy-absorbing device.

  • effect of trigger configuration on the crashworthiness characteristics of natural silk Epoxy Composite tubes
    Composites Part B-engineering, 2013
    Co-Authors: R A Eshkoor, Rozli Zulkifli, Abu Bakar Sulong, Simin Ataollahi Oshkovr, A K Ariffin, Che Husna Azhari
    Abstract:

    In the current study, the quasi-static compression test over natural silk Epoxy Composite tubes was performed using two different trigger mechanisms. The natural silk Epoxy Composite tubes used in this study consisted of 12 layers of woven natural silk as reinforcement and a thermoset Epoxy resin as matrix. The natural silk Epoxy Composite tubes had lengths of 50 mm, and they were associated with external triggers, including four steel pieces located on the downside flat plate fixture and a plug trigger. The failure modes of the natural silk Epoxy Composite tubes were investigated using representative photographs taken during the quasi-static compression test. In addition to the load–displacement graphs, the crashworthiness characteristics of the natural silk Epoxy Composite tubes were exported. The results showed that the four-piece trigger mechanism changed the manner in which failure progressed i.e. from catastrophic to progressive. Plug trigger caused a significant reduction in load carrying capacity and energy absorption capability of specimens. The four-piece trigger retained energy absorption capability of specimens similar to the non-triggered ones, while both the reduction of peak load and increase in crash efficiency of these were observed to be significant.

  • crashworthiness characteristics investigation of silk Epoxy Composite square tubes
    Composite Structures, 2012
    Co-Authors: Simin Ataollahi Oshkovr, R A Eshkoor, A K Ariffin, Siavash Talebi Taher, Che Husna Azhari
    Abstract:

    Abstract This research concentrates on the evaluation of crashworthiness characteristics of natural silk/Epoxy Composite square tubes energy-absorbers. Composite laminate specimens were subjected to static axial compression load and experimental evaluation of the energy absorption capability of silk/Epoxy Composite. Specimens were in the form of square cross-sections with the dimension of 80 mm × 80 mm and a radius curvature of 5 mm. The variables in the experiment were the length of the tubes built 50 mm, 80 mm and 120 mm. Meanwhile, the thickness of the walls, consisting of laminates of silk/Epoxy of 12, 24 and 30 plies, correspond to equivalent wall thickness of 1.7 mm, 3.4 mm and 4.2 mm, respectively. The parameters measured were the total absorbed energy ( E total ), and the crash force efficiency (CFE). E total is the measure of the amount of energy that the structure can withstand without failure and thus is a measure of its strength, while CFE gives a quantitative indication of the mode of failure of the Composites. The mode of failure was observed using photography.

  • energy absorption and failure response of silk Epoxy Composite square tubes experimental
    Composites Part B-engineering, 2012
    Co-Authors: S Ataollahi, A K Ariffin, R A Eshkoor, Siavash Talebi Taher, Che Husna Azhari
    Abstract:

    This paper focuses on natural silk/Epoxy Composite square tubes energy absorption and failure response. The tested specimens were featured by a material combination of different lengths and same numbers of natural silk/Epoxy Composite layers in form of reinforced woven fabric in thermosetting Epoxy resin. Tubes were compressed in INSTRON 5567 with a loading capacity of 30 kN. This research investigates the influence of the wall lengths on the compressive response and also failure mode of the tested tubes are analysed. The load–displacement behaviour of square tubes recorded during the test. Since natural woven silk has been used as textile in centuries but due to rare study of this fabric as reinforcement material for Composites, the results of this paper can be considerable. Outcomes from this paper might be helpful to guide the design of crashworthy structures.

E Hennes - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical properties of Zylon/Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The Zylon/Epoxy Composite is formed by wet-winding Zylon fibre, poly( p -phenylene-2,6-benzobisoxazole) or PBO, with the Epoxy (Stycast 1266). The effects of pre-stress on the distribution and the filling factor of the fibre are studied. It is shown that a Zylon/Epoxy Composite with a uniform fibre distribution and a very high filling factor is achievable. The mechanical properties of the Zylon/Epoxy Composite at room temperature and 77 K are investigated by uni-axial tensile tests and transverse compression tests. The results indicate that the ultimate tensile strength (UTS) of the Zylon/Epoxy Composite is mainly determined by the fraction of the Zylon fibre. The UTS of the Zylon fibres in the Composite is found to be larger than 4.3 GPa. Due to the easy processing and the very high UTS, the Zylon/Epoxy Composite is suitable as reinforcement material for high-field magnet coils.

  • mechanical properties of zylon Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The Zylon/Epoxy Composite is formed by wet-winding Zylon fibre, poly( p -phenylene-2,6-benzobisoxazole) or PBO, with the Epoxy (Stycast 1266). The effects of pre-stress on the distribution and the filling factor of the fibre are studied. It is shown that a Zylon/Epoxy Composite with a uniform fibre distribution and a very high filling factor is achievable. The mechanical properties of the Zylon/Epoxy Composite at room temperature and 77 K are investigated by uni-axial tensile tests and transverse compression tests. The results indicate that the ultimate tensile strength (UTS) of the Zylon/Epoxy Composite is mainly determined by the fraction of the Zylon fibre. The UTS of the Zylon fibres in the Composite is found to be larger than 4.3 GPa. Due to the easy processing and the very high UTS, the Zylon/Epoxy Composite is suitable as reinforcement material for high-field magnet coils.

  • exploding pressure vessel test on zylon Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The efficiency of zylon/Epoxy Composites under radial load for the reinforcement of high-field magnet coils is studied using the exploding pressure vessel technique. Under the combined stresses in tangential and radial directions, the behaviour of zylon/Epoxy Composite is well described by the theory of orthotropic cylindrical shells when the pre-stress effects are considered. The ultimate tensile strength of the zylon/Epoxy shell with a fibre-filling factor of 90% is found to be 4.8 GPa. The bursting pressure (maximal radial stress) is, for a given filling factor, a monotonically increasing function of the ratio of the shell thickness to inner radius. The beneficial effects of the pre-stress during winding on the reinforcement are discussed.

  • Exploding pressure vessel test on zylon/Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The efficiency of zylon/Epoxy Composites under radial load for the reinforcement of high-field magnet coils is studied using the exploding pressure vessel technique. Under the combined stresses in tangential and radial directions, the behaviour of zylon/Epoxy Composite is well described by the theory of orthotropic cylindrical shells when the pre-stress effects are considered. The ultimate tensile strength of the zylon/Epoxy shell with a fibre-filling factor of 90% is found to be 4.8 GPa. The bursting pressure (maximal radial stress) is, for a given filling factor, a monotonically increasing function of the ratio of the shell thickness to inner radius. The beneficial effects of the pre-stress during winding on the reinforcement are discussed.

D Arola - One of the best experts on this subject based on the ideXlab platform.

  • orthogonal cutting mechanisms of graphite Epoxy Composite part ii multi directional laminate
    International Journal of Machine Tools & Manufacture, 1995
    Co-Authors: D H Wang, M Ramulu, D Arola
    Abstract:

    An experimental study of orthogonal cutting mechanisms was conducted in the edge trimming of unidirectional Graphite/Epoxy Composite with polycrystalline diamond tools. The effects of tool geometry and operating conditions were evaluated from an analysis of chip formation, cutting force and machined surface topography. All aspects of material removal were found to be primarily dependent on the fibre orientation. Discontinuous chip formation was noted throughout this study, regardless of trimming parameters. Chip dimensions and force measurements depicted a change in chip formation with fibre orientation, and the presence of three distinct mechanisms in the edge trimming of fiber reinforced Composite material. A combination of cutting, shearing and fracture along the fibre/matrix interface was observed.

  • water jet and abrasive water jet cutting of unidirectional graphite Epoxy Composite
    Composites, 1993
    Co-Authors: M Ramulu, D Arola
    Abstract:

    Abstract Unidirectional graphite/Epoxy Composite material has been machined by water jet and abrasive water jet cutting processes. Topography and morphology of the machined surfaces were evaluated with surface profilometry and scanning electron microscopy. The surface characteristics in terms of roughness and the micromechanisms of material removal for both processes were analysed and compared. Abrasive water jet surface characteristics of graphite/Epoxy were found to be significantly different from those of the water jet cutting process and micromechanical behaviour of material removal was strongly dependent on the fibre orientation.

Y.k Huang - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical properties of Zylon/Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The Zylon/Epoxy Composite is formed by wet-winding Zylon fibre, poly( p -phenylene-2,6-benzobisoxazole) or PBO, with the Epoxy (Stycast 1266). The effects of pre-stress on the distribution and the filling factor of the fibre are studied. It is shown that a Zylon/Epoxy Composite with a uniform fibre distribution and a very high filling factor is achievable. The mechanical properties of the Zylon/Epoxy Composite at room temperature and 77 K are investigated by uni-axial tensile tests and transverse compression tests. The results indicate that the ultimate tensile strength (UTS) of the Zylon/Epoxy Composite is mainly determined by the fraction of the Zylon fibre. The UTS of the Zylon fibres in the Composite is found to be larger than 4.3 GPa. Due to the easy processing and the very high UTS, the Zylon/Epoxy Composite is suitable as reinforcement material for high-field magnet coils.

  • mechanical properties of zylon Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The Zylon/Epoxy Composite is formed by wet-winding Zylon fibre, poly( p -phenylene-2,6-benzobisoxazole) or PBO, with the Epoxy (Stycast 1266). The effects of pre-stress on the distribution and the filling factor of the fibre are studied. It is shown that a Zylon/Epoxy Composite with a uniform fibre distribution and a very high filling factor is achievable. The mechanical properties of the Zylon/Epoxy Composite at room temperature and 77 K are investigated by uni-axial tensile tests and transverse compression tests. The results indicate that the ultimate tensile strength (UTS) of the Zylon/Epoxy Composite is mainly determined by the fraction of the Zylon fibre. The UTS of the Zylon fibres in the Composite is found to be larger than 4.3 GPa. Due to the easy processing and the very high UTS, the Zylon/Epoxy Composite is suitable as reinforcement material for high-field magnet coils.

  • exploding pressure vessel test on zylon Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The efficiency of zylon/Epoxy Composites under radial load for the reinforcement of high-field magnet coils is studied using the exploding pressure vessel technique. Under the combined stresses in tangential and radial directions, the behaviour of zylon/Epoxy Composite is well described by the theory of orthotropic cylindrical shells when the pre-stress effects are considered. The ultimate tensile strength of the zylon/Epoxy shell with a fibre-filling factor of 90% is found to be 4.8 GPa. The bursting pressure (maximal radial stress) is, for a given filling factor, a monotonically increasing function of the ratio of the shell thickness to inner radius. The beneficial effects of the pre-stress during winding on the reinforcement are discussed.

  • Exploding pressure vessel test on zylon/Epoxy Composite
    Composites Part B-engineering, 2002
    Co-Authors: Y.k Huang, P.h Frings, E Hennes
    Abstract:

    Abstract The efficiency of zylon/Epoxy Composites under radial load for the reinforcement of high-field magnet coils is studied using the exploding pressure vessel technique. Under the combined stresses in tangential and radial directions, the behaviour of zylon/Epoxy Composite is well described by the theory of orthotropic cylindrical shells when the pre-stress effects are considered. The ultimate tensile strength of the zylon/Epoxy shell with a fibre-filling factor of 90% is found to be 4.8 GPa. The bursting pressure (maximal radial stress) is, for a given filling factor, a monotonically increasing function of the ratio of the shell thickness to inner radius. The beneficial effects of the pre-stress during winding on the reinforcement are discussed.

R A Eshkoor - One of the best experts on this subject based on the ideXlab platform.

  • effect of trigger configuration on the crashworthiness characteristics of natural silk Epoxy Composite tubes
    Composites Part B-engineering, 2013
    Co-Authors: R A Eshkoor, Rozli Zulkifli, Abu Bakar Sulong, Simin Ataollahi Oshkovr, A K Ariffin, Che Husna Azhari
    Abstract:

    In the current study, the quasi-static compression test over natural silk Epoxy Composite tubes was performed using two different trigger mechanisms. The natural silk Epoxy Composite tubes used in this study consisted of 12 layers of woven natural silk as reinforcement and a thermoset Epoxy resin as matrix. The natural silk Epoxy Composite tubes had lengths of 50 mm, and they were associated with external triggers, including four steel pieces located on the downside flat plate fixture and a plug trigger. The failure modes of the natural silk Epoxy Composite tubes were investigated using representative photographs taken during the quasi-static compression test. In addition to the load–displacement graphs, the crashworthiness characteristics of the natural silk Epoxy Composite tubes were exported. The results showed that the four-piece trigger mechanism changed the manner in which failure progressed i.e. from catastrophic to progressive. Plug trigger caused a significant reduction in load carrying capacity and energy absorption capability of specimens. The four-piece trigger retained energy absorption capability of specimens similar to the non-triggered ones, while both the reduction of peak load and increase in crash efficiency of these were observed to be significant.

  • crashworthiness characteristics investigation of silk Epoxy Composite square tubes
    Composite Structures, 2012
    Co-Authors: Simin Ataollahi Oshkovr, R A Eshkoor, A K Ariffin, Siavash Talebi Taher, Che Husna Azhari
    Abstract:

    Abstract This research concentrates on the evaluation of crashworthiness characteristics of natural silk/Epoxy Composite square tubes energy-absorbers. Composite laminate specimens were subjected to static axial compression load and experimental evaluation of the energy absorption capability of silk/Epoxy Composite. Specimens were in the form of square cross-sections with the dimension of 80 mm × 80 mm and a radius curvature of 5 mm. The variables in the experiment were the length of the tubes built 50 mm, 80 mm and 120 mm. Meanwhile, the thickness of the walls, consisting of laminates of silk/Epoxy of 12, 24 and 30 plies, correspond to equivalent wall thickness of 1.7 mm, 3.4 mm and 4.2 mm, respectively. The parameters measured were the total absorbed energy ( E total ), and the crash force efficiency (CFE). E total is the measure of the amount of energy that the structure can withstand without failure and thus is a measure of its strength, while CFE gives a quantitative indication of the mode of failure of the Composites. The mode of failure was observed using photography.

  • energy absorption and failure response of silk Epoxy Composite square tubes experimental
    Composites Part B-engineering, 2012
    Co-Authors: S Ataollahi, A K Ariffin, R A Eshkoor, Siavash Talebi Taher, Che Husna Azhari
    Abstract:

    This paper focuses on natural silk/Epoxy Composite square tubes energy absorption and failure response. The tested specimens were featured by a material combination of different lengths and same numbers of natural silk/Epoxy Composite layers in form of reinforced woven fabric in thermosetting Epoxy resin. Tubes were compressed in INSTRON 5567 with a loading capacity of 30 kN. This research investigates the influence of the wall lengths on the compressive response and also failure mode of the tested tubes are analysed. The load–displacement behaviour of square tubes recorded during the test. Since natural woven silk has been used as textile in centuries but due to rare study of this fabric as reinforcement material for Composites, the results of this paper can be considerable. Outcomes from this paper might be helpful to guide the design of crashworthy structures.